/*
Copyright (c) 2011 Juan Mellado

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

/*
References:
- "JSR-000202 JavaTM Class File Specification"
  http://jcp.org/aboutJava/communityprocess/final/jsr202/index.html
*/

JD.ConstantPoolTag = {
  CLASS: 7,
  FIELDREF: 9,
  METHODREF: 10,
  INTERFACE_METHODREF: 11,
  STRING: 8,
  INTEGER: 3,
  FLOAT: 4,
  LONG: 5,
  DOUBLE: 6,
  NAME_AND_TYPE: 12,
  UTF8: 1
};

JD.AccessFlag = {
  PUBLIC: 0x0001,
  PRIVATE: 0x0002,
  PROTECTED: 0x0004,
  STATIC: 0x0008,
  FINAL: 0x0010,
  SUPER: 0x0020,
  SYNCHRONIZED: 0x0020,
  VOLATILE: 0x0040,
  BRIDGE: 0x0040,
  TRANSIENT: 0x0080,
  VARARGS: 0x0080,
  NATIVE: 0x0100,
  INTERFACE: 0x0200,
  ABSTRACT: 0x0400,
  STRICT: 0x0800,
  SYNTHETIC: 0x1000,
  ANNOTATION: 0x2000,
  ENUM: 0x4000
};

JD.ClassFile = function(stream){
  this.magic = stream.readU4();
  this.minorVersion = stream.readU2();
  this.majorVersion = stream.readU2();
  this.constantPoolCount = stream.readU2();
  this.constantPool = this.readConstantPool(stream, this.constantPoolCount - 1);
  this.accessFlags = stream.readU2();
  this.thisClass = stream.readU2();
  this.superClass = stream.readU2();
  this.interfacesCount = stream.readU2();
  this.interfaces = this.readInterfaces(stream, this.interfacesCount);
  this.fieldsCount = stream.readU2();
  this.fields = this.readFields(stream, this.fieldsCount);
  this.methodsCount = stream.readU2();
  this.methods = this.readMethods(stream, this.methodsCount);
  this.attributesCount = stream.readU2();
  this.attributes = this.readAttributes(stream, this.attributesCount);
};

JD.ClassFile.prototype.readConstantPool = function(stream, count){
  var pool = [undefined], tag;

  while(count --){
    tag = stream.readU1();

    switch(tag){
      case JD.ConstantPoolTag.CLASS:
        pool.push( new JD.ClassInfo(stream, tag) );
        break;
      case JD.ConstantPoolTag.FIELDREF:
        pool.push( new JD.FieldrefInfo(stream, tag) );
        break;
      case JD.ConstantPoolTag.METHODREF:
        pool.push( new JD.MethodrefInfo(stream, tag) );
        break;
      case JD.ConstantPoolTag.INTERFACE_METHODREF:
        pool.push( new JD.InterfaceMethodrefInfo(stream, tag) );
        break;
      case JD.ConstantPoolTag.STRING:
        pool.push( new JD.StringInfo(stream, tag) );
        break;
      case JD.ConstantPoolTag.INTEGER:
        pool.push( new JD.IntegerInfo(stream, tag) );
        break;
      case JD.ConstantPoolTag.FLOAT:
        pool.push( new JD.FloatInfo(stream, tag) );
        break;
      case JD.ConstantPoolTag.LONG:
        pool.push( new JD.LongInfo(stream, tag) );
        count --;
        pool.push(undefined);
        break;
      case JD.ConstantPoolTag.DOUBLE:
        pool.push( new JD.DoubleInfo(stream, tag) );
        count --;
        pool.push(undefined);
        break;
      case JD.ConstantPoolTag.NAME_AND_TYPE:
        pool.push( new JD.NameAndTypeInfo(stream, tag) );
        break;
      case JD.ConstantPoolTag.UTF8:
        pool.push( new JD.Utf8Info(stream, tag) );
        break;
    }
  }

  return pool;
};

JD.ClassFile.prototype.readInterfaces = function(stream, count){
  var interfaces = [];
  while(count --){
    interfaces.push( new JD.ClassInfo(stream, JD.ConstantPoolTag.CLASS) );
  }
  return interfaces;
};

JD.ClassFile.prototype.readFields = function(stream, count){
  var fields = [];
  while(count --){
    fields.push( new JD.FieldInfo(this, stream) );
  }
  return fields;
};

JD.ClassFile.prototype.readMethods = function(stream, count){
  var methods = [];
  while(count --){
    methods.push( new JD.MethodInfo(this, stream) );
  }
  return methods;
};

JD.ClassFile.prototype.readAttributes = function(stream, count){
  var attributes = [], nameIndex, length;
  
  while(count --){
    nameIndex = stream.readU2();
    length = stream.readU4();

    switch( this.constantPool[nameIndex].stringValue ){
      case "ConstantValue":
        attributes.push( new JD.ConstantValueAttribute(stream, nameIndex, length) );
        break;
      case "Code":
        attributes.push( new JD.CodeAttribute(this, stream, nameIndex, length) );
        break;
      case "StackMapTable":
        attributes.push( new JD.StackMapTableAttribute(stream, nameIndex, length) );
        break;
      case "Exceptions":
        attributes.push( new JD.ExceptionsAttribute(stream, nameIndex, length) );
        break;
      case "InnerClasses":
        attributes.push( new JD.InnerClassesAttribute(stream, nameIndex, length) );
        break;
      case "EnclosingMethod":
        attributes.push( new JD.EnclosingMethodAttribute(stream, nameIndex, length) );
        break;
      case "Synthetic":
        attributes.push( new JD.SyntheticAttribute(stream, nameIndex, length) );
        break;
      case "Signature":
        attributes.push( new JD.SignatureAttribute(stream, nameIndex, length) );
        break;
      case "SourceFile":
        attributes.push( new JD.SourceFileAttribute(stream, nameIndex, length) );
        break;
      case "SourceDebugExtension":
        attributes.push( new JD.SourceDebugExtensionAttribute(stream, nameIndex, length) );
        break;
      case "LineNumberTable":
        attributes.push( new JD.LineNumberTableAttribute(stream, nameIndex, length) );
        break;
      case "LocalVariableTable":
        attributes.push( new JD.LocalVariableTableAttribute(stream, nameIndex, length) );
        break;
      case "LocalVariableTypeTable":
        attributes.push( new JD.LocalVariableTypeTableAttribute(stream, nameIndex, length) );
        break;
      case "Deprecated":
        attributes.push( new JD.DeprecatedAttribute(stream, nameIndex, length) );
        break;
      case "RuntimeVisibleAnnotations":
        attributes.push( new JD.RuntimeVisibleAnnotationsAttribute(stream, nameIndex, length) );
        break;
      case "RuntimeInvisibleAnnotations":
        attributes.push( new JD.RuntimeInvisibleAnnotationsAttribute(stream, nameIndex, length) );
        break;
      case "RuntimeVisibleParameterAnnotations":
        attributes.push( new JD.RuntimeVisibleParameterAnnotationsAttribute(stream, nameIndex, length) );
        break;
      case "RuntimeInvisibleParameterAnnotations":
        attributes.push( new JD.RuntimeInvisibleParameterAnnotationsAttribute(stream, nameIndex, length) );
        break;
      case "AnnotationDefault":
        attributes.push( new JD.AnnotationDefaultAttribute(stream, nameIndex, length) );
        break;
      default:
        attributes.push( new JD.AttributeInfo(stream, nameIndex, length) );
        break;
    }
  }

  return attributes;
};

JD.ClassInfo = function(stream, tag){
  this.tag = tag;
  this.nameIndex = stream.readU2();
};

JD.FieldrefInfo = function(stream, tag){
  this.tag = tag;
  this.classIndex = stream.readU2();
  this.nameAndTypeIndex = stream.readU2();
};

JD.MethodrefInfo = function(stream, tag){
  this.tag = tag;
  this.classIndex = stream.readU2();
  this.nameAndTypeIndex = stream.readU2();
};

JD.InterfaceMethodrefInfo = function(stream, tag){
  this.tag = tag;
  this.classIndex = stream.readU2();
  this.nameAndTypeIndex = stream.readU2();
};

JD.StringInfo = function(stream, tag){
  this.tag = tag;
  this.stringIndex = stream.readU2();
};

JD.IntegerInfo = function(stream, tag){
  this.tag = tag;
  this.bytes = stream.readS4();
};

JD.FloatInfo = function(stream, tag){
  this.tag = tag;
  this.bytes = stream.readS4();
};

JD.LongInfo = function(stream, tag){
  this.tag = tag;
  this.highBytes = stream.readS4();
  this.lowBytes = stream.readS4();
};

JD.DoubleInfo = function(stream, tag){
  this.tag = tag;
  this.highBytes = stream.readS4();
  this.lowBytes = stream.readS4();
};

JD.NameAndTypeInfo = function(stream, tag){
  this.tag = tag;
  this.nameIndex = stream.readU2();
  this.descriptorIndex = stream.readU2();
};

JD.Utf8Info = function(stream, tag){
  this.tag = tag;
  this.length = stream.readU2();
  this.stringValue = stream.readString(this.length);
};

JD.FieldInfo = function(file, stream){
  this.accessFlags = stream.readU2();
  this.nameIndex = stream.readU2();
  this.descriptorIndex = stream.readU2();
  this.attributesCount = stream.readU2();
  this.attributes = file.readAttributes(stream, this.attributesCount);
};

JD.MethodInfo = function(file, stream){
  this.accessFlags = stream.readU2();
  this.nameIndex = stream.readU2();
  this.descriptorIndex = stream.readU2();
  this.attributesCount = stream.readU2();
  this.attributes = file.readAttributes(stream, this.attributesCount);
};

JD.AttributeInfo = function(stream, nameIndex, length){
  this.nameIndex = nameIndex;
  this.length = length;
  this.info = stream.readArrayU1(this.length);
};

JD.ConstantValueAttribute = function(stream, nameIndex, length){
  this.nameIndex = nameIndex;
  this.length = length;
  this.constantValueIndex = stream.readU2();
};

JD.CodeAttribute = function(file, stream, nameIndex, length){
  this.nameIndex = nameIndex;
  this.length = length;
  this.maxStack = stream.readU2();
  this.maxLocals = stream.readU2();
  this.codeLength = stream.readU4();
  this.code = stream.readArrayU1(this.codeLength);
  this.exceptionTableLength = stream.readU2();
  this.exceptionTable = this.readExceptionTable(stream, this.exceptionTableLength);
  this.attributesCount = stream.readU2();
  this.attributes = file.readAttributes(stream, this.attributesCount);
};

JD.CodeAttribute.prototype.readExceptionTable = function(stream, count){
  var table = [];
  while(count --){
    table.push( new JD.ExceptionTableEntry(stream) );
  }
  return table;
};

JD.ExceptionTableEntry = function(stream){
  this.startPc = stream.readU2();
  this.endPc = stream.readU2();
  this.handlerPc = stream.readU2();
  this.catchType = stream.readU2();
};

JD.StackMapTableAttribute = function(stream, nameIndex, length){
  this.nameIndex = nameIndex;
  this.length = length;
  this.numberOfEntries = stream.readU2();
  this.entries = this.readEntries(stream, this.numberOfEntries);
};

JD.StackMapTableAttribute.prototype.readEntries = function(stream, count){
  var entries = [];
  while(count --){
    entries.push( new JD.StackMapFrame(stream) );
  }
  return entries;
};

JD.StackMapFrame = function(stream){
  this.frameType = stream.readU1();
  
  //SAME_LOCALS_1_STACK_ITEM
  if (this.frameType >= 64 && this.frameType <= 127){
    this.stack = this.readVerificationTypeInfo(stream, 1);
  }
  //SAME_LOCALS_1_STACK_ITEM_EXTENDED
  if (this.frameType === 247){
    this.offsetDelta = stream.readU2();
    this.stack = this.readVerificationTypeInfo(stream, 1);
  }
  //CHOP
  if (this.frameType >= 248 && this.frameType <= 250){
    this.offsetDelta = stream.readU2();
  }
  //SAME_FRAME_EXTENDED
  if (this.frameType === 251){
    this.offsetDelta = stream.readU2();
  }
  //APPEND
  if (this.frameType >= 252 && this.frameType <= 254){
    this.offsetDelta = stream.readU2();
    this.locals = this.readVerificationTypeInfo(stream, this.frameType - 251);
  }
  //FULL_FRAME
  if (this.frameType === 255){
    this.offsetDelta = stream.readU2();
    this.numberOfLocals = stream.readU2();
    this.locals = this.readVerificationTypeInfo(stream, this.numberOfLocals);
    this.numberOfStackItems = stream.readU2();
    this.stack = this.readVerificationTypeInfo(stream, this.numberOfStackItems);
  }
};

JD.StackMapFrame.prototype.readVerificationTypeInfo = function(stream, count){
  var types = [];
  while(count --){
    types.push( new JD.VerificationTypeInfo(stream) );
  }
  return types;
};

JD.VerificationTypeInfo = function(stream){
  this.tag = stream.readU1();
  //ITEM_Object
  if (this.tag === 7){
    this.cpoolIndex = stream.readU2();
  }
  //ITEM_Uninitialized
  if (this.tag === 8){
    this.offset = stream.readU2();
  }
};

JD.ExceptionsAttribute = function(stream, nameIndex, length){
  this.nameIndex = nameIndex;
  this.length = length;
  this.numberOfExceptions = stream.readU2();
  this.exceptionIndexTable = stream.readArrayU2(this.numberOfExceptions);
};

JD.InnerClassesAttribute = function(stream, nameIndex, length){
  this.nameIndex = nameIndex;
  this.length = length;
  this.numberOfClasses = stream.readU2();
  this.classes = this.readClassesTable(stream, this.numberOfClasses);
};

JD.InnerClassesAttribute.prototype.readClassesTable = function(stream, count){
  var classes = [];
  while(count --){
    classes.push( new JD.ClassesTableEntry(stream) );
  }
  return classes;
};

JD.ClassesTableEntry = function(stream){
  this.innerClassInfoIndex = stream.readU2();
  this.outerClassInfoIndex = stream.readU2();
  this.innerNameIndex = stream.readU2();
  this.innerClassAccessFlags = stream.readU2();
};

JD.EnclosingMethodAttribute = function(stream, nameIndex, length){
  this.nameIndex = nameIndex;
  this.length = length;
  this.classIndex = stream.readU2();
  this.methodIndex = stream.readU2();
};

JD.SyntheticAttribute = function(stream, nameIndex, length){
  this.nameIndex = nameIndex;
  this.length = length;
};

JD.SignatureAttribute = function(stream, nameIndex, length){
  this.nameIndex = nameIndex;
  this.length = length;
  this.signatureIndex = stream.readU2();
};

JD.SourceFileAttribute = function(stream, nameIndex, length){
  this.nameIndex = nameIndex;
  this.length = length;
  this.sourcefileIndex = stream.readU2();
};

JD.SourceDebugExtensionAttribute = function(stream, nameIndex, length){
  this.nameIndex = nameIndex;
  this.length = length;
  this.debugExtension = stream.readArrayU1(this.length);
};

JD.LineNumberTableAttribute = function(stream, nameIndex, length){
  this.nameIndex = nameIndex;
  this.length = length;
  this.lineNumberTableLength = stream.readU2();
  this.lineNumberTable = this.readLineNumberTable(stream, this.lineNumberTableLength);
};

JD.LineNumberTableAttribute.prototype.readLineNumberTable = function(stream, count){
  var table = [];
  while(count --){
    table.push( new JD.LineNumberTableEntry(stream) );
  }
  return table;
};

JD.LineNumberTableEntry = function(stream){
  this.startPc = stream.readU2();
  this.lineNumber = stream.readU2();
};

JD.LocalVariableTableAttribute = function(stream, nameIndex, length){
  this.nameIndex = nameIndex;
  this.length = length;
  this.localVariableTableLength = stream.readU2();
  this.localVariableTable = this.readLocalVariableTable(stream, this.localVariableTableLength);
};

JD.LocalVariableTableAttribute.prototype.readLocalVariableTable = function(stream, count){
  var table = [];
  while(count --){
    table.push( new JD.LocalVariableTableEntry(stream) );
  }
  return table;
};

JD.LocalVariableTableEntry = function(stream){
  this.startPc = stream.readU2();
  this.length = stream.readU2();
  this.nameIndex = stream.readU2();
  this.descriptorIndex = stream.readU2();
  this.index = stream.readU2();
};

JD.LocalVariableTypeTableAttribute = function(stream, nameIndex, length){
  this.nameIndex = nameIndex;
  this.length = length;
  this.localVariableTypeTableLength = stream.readU2();
  this.localVariableTypeTable = this.readLocalVariableTypeTable(stream, this.localVariableTypeTableLength);
};

JD.LocalVariableTypeTableAttribute.prototype.readLocalVariableTypeTable = function(stream, count){
  var table = [];
  while(count --){
    table.push( new JD.LocalVariableTypeTableEntry(stream) );
  }
  return table;
};

JD.LocalVariableTypeTableEntry = function(stream){
  this.startPc = stream.readU2();
  this.length = stream.readU2();
  this.nameIndex = stream.readU2();
  this.signatureIndex = stream.readU2();
  this.index = stream.readU2();
};

JD.DeprecatedAttribute = function(stream, nameIndex, length){
  this.nameIndex = nameIndex;
  this.length = length;
};

JD.RuntimeVisibleAnnotationsAttribute = function(stream, nameIndex, length){
  this.nameIndex = nameIndex;
  this.length = length;
  this.numAnnotations = stream.readU2();
  this.annotations = this.readAnnotations(stream, this.numAnnotations);
};

JD.RuntimeVisibleAnnotationsAttribute.prototype.readAnnotations = function(stream, count){
  var annotations = [];
  while(count --){
    annotations.push( new JD.Annotation(stream) );
  }
  return annotations;
};

JD.Annotation = function(stream){
  this.typeIndex = stream.readU2();
  this.numElementValuePairs = stream.readU2();
  this.elementValuePairs = this.readElementValuePairs(stream, this.numElementValuePairs);
};

JD.Annotation.prototype.readElementValuePairs = function(stream, count){
  var pairs = [];
  while(count --){
    pairs.push( new JD.ElementValuePair(stream) );
  }
  return pairs;
};

JD.ElementValuePair = function(stream){
  this.elementNameIndex = stream.readU2();
  this.value = new JD.ElementValue(stream);
};

JD.ElementValue = function(stream){
  this.tag = stream.readString(1);
  
  if ("BCDFIJSZs".indexOf(this.tag) !== -1){
    this.constValueIndex = stream.readU2();
  }
  if ("e" === this.tag){
    this.typeNameIndex = stream.readU2();
    this.constNameIndex = stream.readU2();
  }
  if ("c" === this.tag){
    this.classInfoIndex = stream.readU2();
  }
  if ("@" === this.tag){
    this.annotationValue = new JD.Annotation(stream);
  }
  if ("[" === this.tag){
    this.numValues = stream.readU2();
    this.values = this.readValues(stream, this.numValues);
  }
};

JD.ElementValue.prototype.readValues = function(stream, count){
  var values = [];
  while(count --){
    values.push( new JD.ElementValue(stream) );
  }
  return values;
};

JD.RuntimeInvisibleAnnotationsAttribute = function(stream, nameIndex, length){
  this.nameIndex = nameIndex;
  this.length = length;
  this.numAnnotations = stream.readU2();
  this.annotationAnnotations = this.readAnnotations(stream, this.numAnnotations);
};

JD.RuntimeVisibleAnnotationsAttribute.prototype.readAnnotations = function(stream, count){
  var annotations = [];
  while(count --){
    annotations.push( new JD.Annotation(stream) );
  }
  return annotations;
};

JD.RuntimeVisibleParameterAnnotationsAttribute = function(stream, nameIndex, length){
  this.nameIndex = nameIndex;
  this.length = length;
  this.numParameters = stream.readU1();
  this.parameterAnnotations = this.readParameterAnnotations(stream, this.numParameters);
};

JD.RuntimeVisibleParameterAnnotationsAttribute.prototype.readParameterAnnotations = function(stream, count){
  var annotations = [];
  while(count --){
    annotations.push( new JD.ParameterAnnotation(stream) );
  }
  return annotations;
};

JD.ParameterAnnotation = function(stream){
  this.numAnnotations = stream.readU2();
  this.annotations = this.readAnnotations(stream, this.numAnnotations);
};

JD.ParameterAnnotation.prototype.readAnnotations = function(stream, count){
  var annotations = [];
  while(count --){
    annotations.push( new JD.Annotation(stream) );
  }
  return annotations;
};

JD.RuntimeInvisibleParameterAnnotationsAttribute = function(stream, nameIndex, length){
  this.nameIndex = nameIndex;
  this.length = length;
  this.numParameters = stream.readU1();
  this.parameterAnnotations = this.readParameterAnnotations(stream, this.numParameters);
};

JD.RuntimeInvisibleParameterAnnotationsAttribute.prototype.readParameterAnnotations = function(stream, count){
  var annotations = [];
  while(count --){
    annotations.push( new JD.ParameterAnnotation(stream) );
  }
  return annotations;
};

JD.AnnotationDefaultAttribute = function(stream, nameIndex, length){
  this.nameIndex = nameIndex;
  this.length = length;
  this.defaultValue = new JD.ElementValue(stream);
};
